﻿//<!--Copyright (c) 2016
//    Isura Edirisinghe

//        Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.-->

using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Windows;
using System.Windows.Data;
using System.Xml;

namespace Fixtures
{
    /// <summary>
    /// Interaction logic for WPFAboutBox1.xaml
    /// </summary>
    public partial class WPFAboutBox1 : Window
    {
        /// <summary>
        /// Default constructor is protected so callers must use one with a parent.
        /// </summary>
        protected WPFAboutBox1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Constructor that takes a parent for this WPFAboutBox1 dialog.
        /// </summary>
        /// <param name="parent">Parent window for this dialog.</param>
        public WPFAboutBox1(Window parent)
            : this()
        {
            this.Owner = parent;
        }

        /// <summary>
        /// Handles click navigation on the hyperlink in the About dialog.
        /// </summary>
        /// <param name="sender">Object the sent the event.</param>
        /// <param name="e">Navigation events arguments.</param>
        private void hyperlink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
        {
            if (e.Uri != null && string.IsNullOrEmpty(e.Uri.OriginalString) == false)
            {
                string uri = e.Uri.AbsoluteUri;
                Process.Start(new ProcessStartInfo(uri));
                e.Handled = true;
            }
        }

        #region AboutData Provider
        #region Member data
        private XmlDocument xmlDoc = null;

        private const string propertyNameTitle = "Title";
        private const string propertyNameDescription = "Description";
        private const string propertyNameProduct = "Product";
        private const string propertyNameCopyright = "Copyright";
        private const string propertyNameCompany = "Company";
        private const string xPathRoot = "ApplicationInfo/";
        private const string xPathTitle = xPathRoot + propertyNameTitle;
        private const string xPathVersion = xPathRoot + "Version";
        private const string xPathDescription = xPathRoot + propertyNameDescription;
        private const string xPathProduct = xPathRoot + propertyNameProduct;
        private const string xPathCopyright = xPathRoot + propertyNameCopyright;
        private const string xPathCompany = xPathRoot + propertyNameCompany;
        private const string xPathLink = xPathRoot + "Link";
        private const string xPathLinkUri = xPathRoot + "Link/@Uri";
        #endregion

        #region Properties
        /// <summary>
        /// Gets the title property, which is display in the About dialogs window title.
        /// </summary>
        public string ProductTitle
        {
            get
            {
                string result = CalculatePropertyValue<AssemblyTitleAttribute>(propertyNameTitle, xPathTitle);
                if (string.IsNullOrEmpty(result))
                {
                    // otherwise, just get the name of the assembly itself.
                    result = Path.GetFileNameWithoutExtension(Assembly.GetExecutingAssembly().CodeBase);
                }
                return result;
            }
        }

        /// <summary>
        /// Gets the application's version information to show.
        /// </summary>
        public string Version
        {
            get
            {
                string result = string.Empty;
                // first, try to get the version string from the assembly.
                Version version = Assembly.GetExecutingAssembly().GetName().Version;
                if (version != null)
                {
                    result = version.ToString();
                }
                else
                {
                    // if that fails, try to get the version from a resource in the Application.
                    result = GetLogicalResourceString(xPathVersion);
                }
                return result;
            }
        }

        /// <summary>
        /// Gets the description about the application.
        /// </summary>
        public string Description
        {
            get { return CalculatePropertyValue<AssemblyDescriptionAttribute>(propertyNameDescription, xPathDescription); }
        }

        /// <summary>
        ///  Gets the product's full name.
        /// </summary>
        public string Product
        {
            get { return CalculatePropertyValue<AssemblyProductAttribute>(propertyNameProduct, xPathProduct); }
        }

        /// <summary>
        /// Gets the copyright information for the product.
        /// </summary>
        public string Copyright
        {
            get { return CalculatePropertyValue<AssemblyCopyrightAttribute>(propertyNameCopyright, xPathCopyright); }
        }

        /// <summary>
        /// Gets the product's company name.
        /// </summary>
        public string Company
        {
            get { return CalculatePropertyValue<AssemblyCompanyAttribute>(propertyNameCompany, xPathCompany); }
        }

        /// <summary>
        /// Gets the link text to display in the About dialog.
        /// </summary>
        public string LinkText
        {
            get { return GetLogicalResourceString(xPathLink); }
        }

        /// <summary>
        /// Gets the link uri that is the navigation target of the link.
        /// </summary>
        public string LinkUri
        {
            get { return GetLogicalResourceString(xPathLinkUri); }
        }
        #endregion

        #region Resource location methods
        /// <summary>
        /// Gets the specified property value either from a specific attribute, or from a resource dictionary.
        /// </summary>
        /// <typeparam name="T">Attribute type that we're trying to retrieve.</typeparam>
        /// <param name="propertyName">Property name to use on the attribute.</param>
        /// <param name="xpathQuery">XPath to the element in the XML data resource.</param>
        /// <returns>The resulting string to use for a property.
        /// Returns null if no data could be retrieved.</returns>
        private string CalculatePropertyValue<T>(string propertyName, string xpathQuery)
        {
            string result = string.Empty;
            // first, try to get the property value from an attribute.
            object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(T), false);
            if (attributes.Length > 0)
            {
                T attrib = (T)attributes[0];
                PropertyInfo property = attrib.GetType().GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);
                if (property != null)
                {
                    result = property.GetValue(attributes[0], null) as string;
                }
            }

            // if the attribute wasn't found or it did not have a value, then look in an xml resource.
            if (result == string.Empty)
            {
                // if that fails, try to get it from a resource.
                result = GetLogicalResourceString(xpathQuery);
            }
            return result;
        }

        /// <summary>
        /// Gets the XmlDataProvider's document from the resource dictionary.
        /// </summary>
        protected virtual XmlDocument ResourceXmlDocument
        {
            get
            {
                if (xmlDoc == null)
                {
                    // if we haven't already found the resource XmlDocument, then try to find it.
                    XmlDataProvider provider = this.TryFindResource("aboutProvider") as XmlDataProvider;
                    if (provider != null)
                    {
                        // save away the XmlDocument, so we don't have to get it multiple times.
                        xmlDoc = provider.Document;
                    }
                }
                return xmlDoc;
            }
        }

        /// <summary>
        /// Gets the specified data element from the XmlDataProvider in the resource dictionary.
        /// </summary>
        /// <param name="xpathQuery">An XPath query to the XML element to retrieve.</param>
        /// <returns>The resulting string value for the specified XML element. 
        /// Returns empty string if resource element couldn't be found.</returns>
        protected virtual string GetLogicalResourceString(string xpathQuery)
        {
            string result = string.Empty;
            // get the About xml information from the resources.
            XmlDocument doc = this.ResourceXmlDocument;
            if (doc != null)
            {
                // if we found the XmlDocument, then look for the specified data. 
                XmlNode node = doc.SelectSingleNode(xpathQuery);
                if (node != null)
                {
                    if (node is XmlAttribute)
                    {
                        // only an XmlAttribute has a Value set.
                        result = node.Value;
                    }
                    else
                    {
                        // otherwise, need to just return the inner text.
                        result = node.InnerText;
                    }
                }
            }
            return result;
        }
        #endregion
        #endregion
    }
}
